题目内容

(2007?东城区)
56-47= 10-0.27= 5-2.5= 6.3+0.7= 6÷0.5=
8.4÷4.2= 2.5×4= 1-
2
3
=
1
3
+
1
2
=
1
4
+
3
4
=
8
3
÷
8
3
=
9÷10=
5
6
-
2
3
=
4
5
-
1
2
=
5
9
×18
=
1
2
×
1
2
=
2
13
×2
=
5
6
=
8
9
÷4
=
5
26
×13
=
2
7
=
12×
2
3
=
5
6
×
2
5
=
2
3
×
3
4
=
4
5
÷
1
5
=
1
8
=
4
7
×
7
8
=
5
6
=
1
4
÷
1
3
=
6
7
÷
3
14
=
分析:根据运算的法则直接求解,小数计算注意小数的位数,分数的计算注意把结果化成最简分数.
解答:解:
56-47=9, 10-0.27=9.73, 5-2.5=2.5, 6.3+0.7=7, 6÷0.5=12,
8.4÷4.2=2, 2.5×4=10, 1-
2
3
=
1
3
1
3
+
1
2
=
5
6
1
4
+
3
4
=1,
8
3
÷
8
3
=1,
9÷10=0.9,
5
6
-
2
3
=
1
6
4
5
-
1
2
=
3
10
5
9
×18
=10,
1
2
×
1
2
=
1
4
2
13
×2
=
4
13
5
6
=0,
8
9
÷4
=
2
9
5
26
×13
=
5
2
2
7
=21,
12×
2
3
=8,
5
6
×
2
5
=
1
3
2
3
×
3
4
=
1
2
4
5
÷
1
5
=4,
1
8
=8,
4
7
×
7
8
=
1
2
5
6
=6,
1
4
÷
1
3
=
3
4
6
7
÷
3
14
=4.
点评:完成本题要根据运算法则认真分析式中数据,然后快速准确得出答案.
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